Sable V6-3.0L VIN U (1999)
Ignition Coil: Description and Operation
Ignition Coil
The ignition coil is mounted on the rear of the LH cylinder head. The ignition coil contains three separate ignition coils. Each ignition coil is controlled
by the Powertrain Control Module (PCM) through three coil leads. Each ignition coil activates two spark plugs simultaneously:
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one spark plug on the compression stroke. This spark plug uses the majority of the ignition coil's stored energy.
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one spark plug on the exhaust stroke. This spark plug will use very little of the ignition coil's stored energy.
These two spark plugs are connected in series, so the firing voltage of one spark plug will be negative with respect to ground, and the other spark plug
will be positive with respect to ground.
